import java.util.Scanner;

public class fd {
	public static void main (String[] args) { 
		Scanner sc=new Scanner(System.in);
		  System.out.println("请输入年份");
		  int year=sc.nextInt();
		  System.out.println("请输入月份");
		  int month=sc.nextInt();
		  int day;
	switch (month) {
	case 1:
	case 3:
	case 5:
	case 7:
	case 8:
	case 10:
	case 12:
		day=31;
		break;
	case 4:
	case 6:
	case 9:
	case 11:
		day=30;
		break;
	case 2:
		if (year % 4==0 && year % 100 !=0 || year % 400==0) {
			day=29;
		}else {
			day=28;
		}
		break;
	default:
		day=0;
		System.out.println("错误的年份");
		break;
	   }
	System.out.println(year+"年"+month+"月，有："+day+"天");
	}
}
